Improvement in steam-engine balanced valves



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@anni l @ffice WILLIAM EVERED, OFCHICAGO, ILLINOIS.

Letters Patent N o. 86,381,

dated February 2, 1869.

MPROVMENT .IN STEAM-ENGINE BALANCED vALVES.

The Schedule referred to in Vthese Letters Patent and making part of thesame.

To all whom this may concern:

Beit known that I, WILLLAM Evnnnn, of Chicago, inthe county of Cook, andState of Illinois, have invented an Improved Balance-Valve; and I dohereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,and letters of reference marked thereon, making a part of thisdescription, in which- Figure 1 is a perspective representation of myinvention.

Figure 2, a top view of the same.

Figure 3, a view ofthe bottom, the valve being inverted.

Figure 4, a representation ofthe inner part removed from the shell.

Figure 5, a vertical section, taken through the inner part on the line:c x, g. 3, and through the outer part on the line x 1v, fig. 2. i

The present invention' relates to an improvement in that class ofsteam-valves that are so balanced, as to operate under a heavy pressureof steam, by the application of only so much power asis required toovercome the friction of the part-s.

To enable others to fully comprehend the construction and nature of myinvention, I have marked corresponding parts with similar letters, andwill now give a detailed description.

F represents a cylindrical metal seat, having a screwthread cut on thelower part of its periphery, for securing it in position t'oasteam-chest or steamepipe,

Attached to the inner periphery ci' this cylinder, and projecting inwardfrom it, are four wings, G', which are cast solid to it, and proj ectfar enough upward to provide a suitable guide for areciprocatingvalve-shell, S, when it is opened to give a suitablesteam-area.

"Oast'solid to the upper ends of these wings C', is a plate or disk, A,whose periphery is even with the outer edges of said \vings,"and has itsupper corner so bevelled inward as to t a seat, I, made on the innerpeliphery of the shell S, as it is shown at iig, 5,

This shell is made of any suitable metal, and to slide easily on thewings C', and it has suitable openings between the arms B, to permit afull pressure of steam to bear on the top of the disk A.

, The lower edge of this shell is so bevelled off as to fit closelyagainst a seat, H, fig. 5, made on the top of the cylinder F, while, atthe Same time, the seat I bears on the disk A, both seats beingsteam-tight.

The inner ends of the arms B support a cylindrical projection, E, towhich a valve-stem, D, is fastened in the usual manner.

In the manufacturing of valves, care must be taken to make the areabetween the arms C and cylinder F, iig. 3, equal to the area of suchsteam-port or ports, as would be suited for an engine to which my valveis to be attached, and to give the valve-stem-D such length of strokeaswill givea corresponding area between the lower edge of the shell Sand seat H.

It will be seen, from this description, that the shell S operates underonly so much pressure as is necessary to hold it in position, andprevent any imperfect operation of the engine from accidentally openingit.

Having thus described my invention,

What I claim, and desire to secure by Letters Patent, is-

The construction of the balanced valve, with cylinder F, seat H,guide-arms C, plate A, and shell S, with its seat I, substantially asset forth.V i

WILLIAM EVERED.

Witnesses:

G. L. GHAPIN, E. E. GIBSON.

